Roller assemblies



Sept 18, 1962 H. H. wAGNoN ETAL. 3,054,466

RQLLER ASSEMBLIES Blf/647 d f fam/Z A rfa/iwf Kr SePt- 18, 1962 H. H.wAGNoN ETAL 3,054,466

ROLLER ASSEMBLIES ffy@ /f ff@ 3 Sheets-Sheet 3 H. H. WAGNON ETAL ROLLERASSEMBLIES Sept. 18, 1962 Filed sept. 21, 1959 JW u nite 31| rates Thisinvention relates to new and useful improvements in roller assemblies,and particularly those roller assemblies which are adapted for use inreaming out or enlarging Well bores to a desired diameter and also thosewhich are adapted for rolling out collapsed casing or pipe.

'I'his application is a continuation in part of patent application,Serial No. 783,533, filed December 29, 1958, now abandoned.

An object of this invention is to provide a new and improved rollerassembly for use in wells and the like, wherein the roller in theassembly is a reamer for enlarging well bores, or a casing roller forenlarging collapsed casing or pipe, or any other type of roller whichmay be advantageously used by moving same to different positions on asupport body during various stages of use of the assembly.

Another object of this invention is to provide a new and improved reamerfor use in Wells and the like wherein each reamer cutter is adapted tobe moved outwardly to one or more selected cutting or reaming positionswith respect to the body of the reamer to compensate for the wearing ofeach cutter, whereby the useful life of each cutter is greatlyincreased.

An important object of this invention is to provide a new and improvedmounting means for mounting a roller on a support body so that the axisof rotation of the roller is shifted outwardly in a well bore to one ormore different selected positions during the use of the roller.

A further object of this invention is to provide a new and improvedroller assembly wherein a roller is mounted on a pin for rotationrelative thereto, wherein eccentric means are provided for shifting thepin to shift the axis of rotation of the roller thereon, and whereinmeans are provided to lock the pin in selected positions in which theaxis of rotation of the roller is different for each position.

A particular object of this invention is to provide a new and improvedreamer construction wherein a reamer cutter is mounted on a pin forrotation relative thereto, wherein eccentric means are provided forshifting the pin to shift the axis of rotation of the reamer cutterthereon, and wherein means are provided to lock the pin in selectedcutting positions in which the axis of rotation of the reamer cutter isdifferent for each cutting position.

A specific object of this invention is to provide a specific casingroller assembly having a plurality of rollers mounted on a support bodyfor rolling the interior of a collapsed casing or pipe to enlarge thecasing or pipe to its full internal diameter, wherein each casing rolleris mounted on a shaft or pin which is eccentrically positioned on thesupport body for changing the position of casing roller relative to thesupport body without requiring removal of the roller from the body.

The preferred embodiment of this invention will be describedhereinafter, together with other features thereof, and additionalobjects will become evident from such description.

The invention will be more readily understood from a reading of thefollowing specication and by reference to the accompanying drawingsforming a part thereof, wherein an example of the invention is shown,and wherein:

FIG. 1 is an elevation of one form of this invention wherein a reamerincorporating the features of this invention is shown;

3,354,466 Patented Sept. 18, 1962 FIG. 2 is a view, partly in sectionand partly in elevation taken on line 2--2 of FIG. l, to illustrate thedetails of the preferred form of the new and improved roller assemblymounting construction of this invention;

FIG. 3 is a schematic view illustrating the first position of the pinfor supporting the roller such as a reamer cutter or casing roller;

FIG. 3A is a schematic view which is viewed from the top of the toolschematically shown in FIG. 3 to illustrate the initial position of oneroller and the mounting assem- -bly in use for reaming a hole or wellbore, or for expanding a collapsed casing, or for performing similaroperations;

FIG. 4 is a view similar to FIG. 3, but illustrating the pin for theroller or reamer cutter in a second cutting position;

FIG. 4A is a view similar to FIG. 3A and it is also a schematic planView taken from the upper end of the illustration of FIG. 4 toillustrate the shifting of the central axis of the roller reamer cutterpin;

FIG. 5 is a view similar toV FIGS. 3 and 4, but it illustrates a thirdposition of the pin for the reamer cutter or casing roller;

FIG. 5A is a view similar to FIGS. 3A and 4A, but it illustrates thethird position of the pin for the reamer cutter or casing roller asillustrated in FIG. 5 to show the further change in the position of thecentral axis of the pin as compared to FIGS. 3A and 4A;

FIG. 6 is a view similar to FIGS. 3, 4 and 5, except that a fourthposition of the pin is shown;

FIG. 6A is a view similar to FIGS. 3A, 4A and 5A, and it shows aschematic plan illustration of the structure illustrated in FIG. 6 toillustrate the maximum shift in the central axis of the pin from theinitial position shown in FIG. 3;

FIG. 7 is a plan view showing a modified form of the pin of thisinvention wherein the upper and lower pin sections are formed in asquare shape rather than in a round shape as illustrated in FIGS. 2-6;

FIG. 8 is a view, partly in elevation and partly in section,illustrating a modification of the pin of FIG. 2, Wherein separatesleeves are provided with the pin for mounting the pin to effect theshifting of the central axis of the P111;

FIG. 9 is a plan view taken on line 9-9 of FIG. 8 to illustrate more indetail the modified construction of FIG. 8;

FIG. 10 is a view, partly in elevation and partly in section,illustrating another form of the invention ernploying casing rollerswhich are mounted in accordance with the invention; and

FIG. ll is a vertical sectional view of a portion of the structure shownin FIG. l0 to illustrate in detail the mounting of one of the casingrollers on a support body.

In the drawings, the letter R designates generally a reamer whichincludes one or more reamer cutters, or rollers 10, which are preferablythree in number, for engagement with the wall of a previously drilledhole or well bore. Briefly, in the form of this invention illustrated inFIGS. 1-9, each of the reamer cutters 10 is mounted on a reamer cutterpin 11 in such manner that the central axis of the portion of the pin 11which is in the bore of the cutter 10 is moved outwardly with respect tothe body 12 of the reamer R, so that as the diameter of each of thecutters 10 is reduced by wear during use or for other reasons, thereamer cutters 1G may still be used for reaming the same size of hole orwell bore. Therefore, by reason of the construction of this invention,the useful life of each of the reamer cutters 10 on the reamer R isincreased to a great extent. Also, as will be explained hereinafter,another form of this invention is illustrated in FIGS. 10 and ll, butexcept for the type 3 of rollers employed and the intended use thereof,the structure of FIGS. 10 and 11 is basically the same as the structureof FIGS. l-9.

Considering the invention in detail, the reamer body 12 is tubular andis provided with a threaded coupling pin 12a `at its upper end forconnection with the usual pipe or string used to support a reamer duringthe reaming of a well bore or similar hole. The body 12 has a centralopening (not shown) extending longitudinally through the body 12 in theusual manner for the circulation of drilling mud or other well fluid.

Since each of the reamer cutters 10 is mounted on the reamer body 12 inan identical manner in the preferred form of the invention, the mountingstructure for one of the reamer cutters 10 only will be describedbecause such description will apply to the other mounting structure forthe other reamer cutters 10. Thus, each reamer cutter 10 has associatedtherewith a pin 11 Ywhich extends through the bore 10a of the cutter 10.The cutter 10 is provided with the usual cutting teeth 10b on theexternal surface thereof for cutting engagement with the wall of thewell fbore or other hole being reamed or cut by the reamer cutters 10.

In the storm of the invention illustrated in FIGS, 1 and 2 of thedrawings, the pin 11 has a central pin section 11a, an upper pin section11b, and a lower pin section llc. The central longitudinal axis oftheupper pin section 11b is coincident or in vertical alignment with thecentral longitudinal `axis of the llower pin section 11C. The diameterof the lower pin section 11C is smaller than the diameter of thecentr-al pin section 11a and also, the upper pin section 11b. However,the relative diameters of the various sections of the pin 11 areimmaterial so long as the central axes of the upper pin section 11b andthe lower pin section 11C `are coincident and are laterally oiset withrespectY to the central axis of the central pin section 11a.

An'upper support collar or member 14 is provided for receiving the upperpin section 11b, and a lower support collar or member 15 is provided forreceiving the lower pin section 11c of each of the pins 11. Such uppersupport collar 14 and lower support collar 15 are formed integrally withthe body 12 of the reamer R or they are welded or are otherwiseY securedto the` body 12. upper support collar 14 has a longitudinal opening orbore 14a therethrough for receiving the upper pin section 11b. Similarlythe lower support collar 15 has a central longitudinal bore 15a forreceiving the lower pin section 11C. The longitudinal central axes ofthe bore 14a and the lower bore 15a are in alignment or are coincidentand therefore, the axes ofthe bores 14a and 15a are coincident with theaxes of the pin sections 11b and 11c. However, all of such axes areoiset laterally with respect to the central -axis of the central pinsection 11a.

The -body 12 of the reamer RV is formed with a longitudinal recess orexternal pocket 12a for each of the reamer cutters 10. Each of suchrecesses or pockets 12a extends longitudinally between Ythe yuppercollar 14 and the lower collar 15 and such recesses or pocketsV 12a areprovided so that the inside portion of the cutters 10 will not contactthe body 12 when the cutters 10 are mounted and are rotating in use. Thebody 12 also has a longitudinal groove or recess 12b formed above each'Vof the upper collars 14. Such grooves or recesses 12b are providedforthe insertion of the pins 11 through the collars 14 and the reamers 10and finally for the seating of the lower pin sections 11e in the lowercollars 1S. Such assembly Will be described more in detail hereinafter,but briefly it can be pointed out that the pins 11 are inserted fromabove the collars 14 -and the grooves or recesses 12b permit thevertical alignment of the pins 11 with the open-V ings or bores 14a and15a so that the pins 11 may drop vertically downwardly and may passthrough the bore 10a Iof each of the cutters 10 for the assembly of thecutters 10 on the pins 11. In the preferred form of the invention, thecentral pin ysection 11a is of a larger diameter than the lower pinsection 11C so that a shoulder 11d is provided between thercentral pinsection 11a and the lower pin section 11C for engagement with the upperlateral surface 15b of the lower collar 15. Such engagement prevents thedropping of the pin 11 below the position shown in FIG. 2 wherein theshoulder 11dis in engagement with the surface or shoulder 15b.

To eliminate wear on the collar 14 and on the collar 15 by the upper andlower ends, respectively, of the cutter during the rotation of thecutter on the pin 11, removable and replaceable Wear rings 20 and 21 areprovided at the upper and lower ends of the cutter 10, respectively. Theupper wear ring 20 has a vertically extending tabK or projection 20awhich extends into ra hole or opening 14b in the collar 14. Similarly,the wear ring 21 has a vertically extending tab orfprojection 21a whichextends into an opening C in the collar 15. Such tabs 20a and 21a serveto prevent the wear rings 20' and 21, respec- TheU tively, from rotatingwith the cutter 10. .The wear rings 20 and 21 may be replaced when thecutter 10 is replaced.

As will be more fully explained in connection with the operation or useof the reamer of this invention, the pin 11 is adapted to be rotated orotherwise moved so that each of the cutters 10 is moved radially orlaterally outwardly from the body 12 to compensate for the wear on theexternal cutting teeth 10b of each of the cutters 10, so that thecutters 10 can be used for cutting the same diameter hole or well borefor a much greater period of use than is normally possible beforereplacing the cutters. In the form of the invention illustrated in FIG.2, the shifting or movement of the pin 11 to shift or move each of thecutters 10 is accomplished by 4a rotation of the pin 11 With each cutter10i. Thus, asV shown in FIG. 2, the pin 11 has an Allen socket oropening 11e at its upper end for receiv- -ing an Allen wrench or asimilar tool. Of conse, other equivalent means for effecting therotation of the pin 11 on the body 12 without necessitating the removalof the pin 11 could be substituted for the Allen head opening 11e.

The pin 11 must be locked in each cutting position. In order toaccomplish such locking, in the form of the invention illustrated inFIG. 2, the upper pin section 11b is provided with laterally extendingopenings 11]c and 11g which are placed at an angle xwith respect to eachother. In the preferred form of the invention, the vertical plane inwhich the center of the upper opening 11g lies would intersect thevertical plane in which the center of the lower opening 11f lies at anangle which is one hundred twenty on one side of the intersection andsixty degrees on the other side of the intersection. With such relativepositions of the openings 11]c and 11g, it has been found that fourpositions for the use of each cutter 10 are made possible and a maximumuse of thecutters 10 is also obtained.

The upper collar 14 has openings 14c and 14d formed therethrough whichare positioned one above the other in `the same vertical plane andparallel to each other. The lower opening 14e is adapted to be alignedwith the opening 11]c in the pin 11 for receiving a lock rod 30\ forlocking or holding the pin 11 ina selected position with respect to thebody 12. The pin 30 is retained in the openings 14C and 11jc Iby meansof a removable screw 31 or any other similar means which extends intothe end of the opening 14e so that the rod 30 cannot be withdrawn fromthe -opening 14C until the screw 31 or other means is removed.

The opening 11g is adapted to be aligned with the upper opening 14d, andwhen such alignment occurs, the rod 30, or some other rod similarthereto is positioned in the openings 14d and 11g. A lock screw 31 orsimilar plug means is then used for retaining the lock rod 30 or similarrod in the openings 14d and 11g. It will be understood that the rod 30or similar rod would be in either the lower position shown in FIG. 2 orit would be in the upper position through the openings 14d and 11g, butthe rod 30 would not be in both openings 14e and 14d at the same time.

'Ihe use of the form of the invention shown in FIGS. l and 2 isillustrated by the schematic illustrations appearing in FIGS. 3, 3A, 4,4A, 5, 5A, 6 and 6A. FIGS. 3 and 3A illustrate the rst position of oneof the cutters and the pin 11 therewith. The cutter is shown with adotted line in FIG. 3A, the upper pin section 11b is shown in a solidline and the central pin section 11a is shown in dotted lines in FIG.3A. The Well bore or opening W is partially shown in FIG. 3A toillustrate the engagement of 4the cutter 10 with the wall of the wellbore or hole W. In the illustration of FIG. 3, the cutter 10 has beenomitted for clarity, and the position of the lock rod 30 in the opening11f is illustrated for the initial cutting position. The longitudinalcentral axis of the central pin section 11a is indicated at 4G in FIG.3A and the initial distance from the longitudinal central axis 4t) tothe well bore W or the external surface of the cutter 10 is indicated bythe arrows and the letter X in FIG. 3A.

The rearner R of this invention is used with the cutters 10 in theinitial cutting positions which is illustrated for one of the cutters 10in FIG. 3 and 3A.

When the cutter 1G becomes worn so that it is not effectively cuttingthe same diameter or substantially the same diameter in the well bore orhole W, then the cutter pins 11 are turned or are rotated. Such rotationis accomplished by first removing the set screw or plug 31 (FIG. 2) andthen sliding the lock rod 3G out of the openings 11)c and 14C. Suchsliding movement of the lock rod 3G would be in the right-hand directionas viewed in FIG. 2 of the drawings. The cutter pin 11 can then beturned or rotated by engaging the multi-sided opening 11e with an Allenwrench or similar tool until the opening 11g is aligned with the opening14d. When such alignment occurs the cutter pin 11 is again locked to thebody 12 by inserting the lock rod 30 into the openings 11g and 14d. Theset screw or plug 31 is inserted in the opening provided at 31a in FIG.2 so that the lock rod 36 is held in the openings 11g and 14d. Suchposition of the cutter pin 11 is illustrated in FIGS. 4 and 4A. Theparts are illustrated in FIGS. 4 and 4A in the same manner as in FIGS. 3and 3A except for the amount of rotation effected by the movement of thepin 11 to the new position with the lock rod 30 in the openings 11g and14d. The comparison between the line L in FIG. 3A and the line L in FIG.4A shows that the amount of movement with the particular form of theinvention shown in FIG. 2 is sixty degrees because of the particularangles of the openings 11g and lllf with respect to each other. 'I'hecutter 10 is shown in FIG. 4A as reduced in diameter as compared to thediameter of the cutter 1@ as illustrated in FIG. 3A to illustrate thewearing or reduction in diameter because of wearing or other causes asthe cutter 1G is used. The shifting of the cutter pin 11 effects a shiftin the position of the longitudinal central axis 40 of the central pinsection 11. The amount of such movement is indicated in FIG. 4A by theletter A and the arrows therewith. The original distance X which wasreferred to in connection with FIG. 3A is also shown in FIG. 4A toillustrate the 6 comparative movement of the longitudinal central axis40 with respect to the outer surface of the cutter 10` and the well boreW. The distance X minus A shown with arrows in FIG. 4A shows the actualdistance of the longitudinal central axis 40 from the well bore W. Itcan therefore be seen that the central axis 40 has moved outwardly fromthe body 12 a distance equal to the distance between the arrowsdesignated with the letter A.

In FIG. 5, the next intermediate position is illustrated wherein the rod30 is still in the opening 11g, but the pin 11 has been rotated onehundred eighty degrees as indicated by the position of the line L inFIG. 5A. In other Words, the line L in FIG. 4A is exactly one hundredeighty degrees from the line L in FIG. 5A. This is be- CIK cause the pin11 has been rotated one hundred eighty degrees and then the rod 30 hasbeen reinserted into the opening 11g in the opening 14d to again lockthe pin 11 in the second intermediate cutting position, the firstintermediate cutting position being that shown in FIGS. 4 and 4A. InFIG. 5A, the letter B indicates the distance -that the longitudinalcentral axis 49 has been moved or shifted with respect to the body 12from its original position shown in FIG. 3A. The distance X shown by thearrows in FIG. 5A is the same distance X illustrated in FIG. 3A and thedistance X minus B indicated by the arrows shows the distance thecentral axis 40 of the section 11a is from the wall of the well bore W.The diameter of the cutter 10 is reduced in FIG. 5A asI compared to FIGS3A and 4A to illustrate the effect of the reduction in diameter of thecutter 10. In other words, by the shifting of the central axis 40 asillustrated in FIG. 5A, the same diameter of well bore W is being cutwith the cutter 10 even though the diameter of the cutter 16 is reducedfrom wear or otherwise.

FIG.6 illustrates the nal position of the cuter pin 1l wherein themaximum movement of the longitudinal central axis 49 from its originalposition shown in FIG. 3 has been obtained. In FIG. 6, the rod 30 hasbeen reinserted in the opening Illf and the opening 14C alignedtherewith, but the pin 11 is rotated one hundred eighty degrees from theposition illustrated in FIG. 3. The letter C designates the distancebetween the arrows for showing the extent of the movement of the centralaxis 41B from its original position shown in FIG. 3A. 'Ihe letter Ctherefore designates the amount of movement of the cuter 10 and the pin11 with respect to the body 12 of the reamer R. The distance designatedwith the letter X and with the arrows therewith is the same distanceindicated in FIG. 3A and the ultimate or iinal distance of the centralaxis 40 from the wall of the well bore W is indicated by the arrows andthe designation X minus C.

It can therefore be seen by a comparison of FIGS. 3-6, inclusive andFIGS. 3A-6A, inclusive, that the cutter pin 11 is adapted to bepositioned in an initial cutting position, two intermediate cuttingpositions and a final cutting position. The number of the openings 11fand 11g may be increased and the angles of such openyings with respectto each other may also be changed to obtain different amounts ofmovement of the pin 11 and also to obtain dierent numbers ofintermediate positions, but it has been found that the two intermediatepositions shown in FIGS. 4 and 5 provide the desired cutting action asthe cutter 10 wears while avoiding the necessity for any excessivenumber of changes in the position of the cutter pin 11.

In FIG. 7, a modication is illustrated wherein the upper pin section111]) is square or is formed' with flat sides rather than being formedin a cylindrical shape as the upper pin section 11b. The lower pinsection 11C could likewise be formed in a square shape or in a fiatsided shape rather than being cylindrical as illustrated in FIG. 2.However, it will be appreciated that if the square or flat sidedconstruction of the upper pin section and the lower pin section areutilized, the pin support collars 14 and 15 would likewise have to bemodified to accommodate such differences in shape. Other- Wise, the useand operation would be substantially the came as that describedheretofore in connection with the reamer illustrated in FIGS. l-6.

FIGS. 8 and 9 illustrate another modification of the reatner of thisinvention, and particularly the pin y11 of this invention. In FIGS. 8and 9, the pin 211 is of the same diameter throughout its length, butsleeves 211!) and 211e are provided which form eccentric mountings forthe pin 211 similar to the upper pin section 11b and the lower pinsection 11C, respectively. The lower pin sleeve 211C would preferably beconnected with the pin 211 with a key or spline 5G which preventsrelative rotation between the pin 211 and the sleeve 211C. The sleeve211'b4would be locked with the pin 211 with a lock rod 23) or any othersimilar locking means similar to therod 30 illustrated in FIG. 2. Suchrod 23) would extend through the pin 211, the sleeve 21119 and msothrough an opening such as the opening 14e in the support collar 14 ofFIG. 2 (not shown in FIG. 8). The central longitudinal axes of thesleeve 2 11b and the sleeve 211e would be in alignment or would becoincident with each other, but they would be laterally otset withrespect to the longitudinal central axis of the cutter pin 211.Therefore, in use, the rnoditied form shown in FIGS. 8 and 9 wouldfunction in the same manner as explained previously in connection withthe form of the' invention shown in FIGS. l-6. It will be appreciatedthat instead of the sleeves 211k and 211e being cylindrical, they canassume other shapes such as the square shape proposed in themodiiication of FIG. 7. l

The form of the invention illustrated in particular in FIGS. 10 and 1lis basically the same as the structure illustrated and described inconnection with FIGS. 1 6. Referring now to FIGS. 10 and l1, the supportbody 312 corresponds with the support body 12 of the reamer R. However,the particular manner of assembling the sections of the body 312 diiersfrom that described above in connection with the body 12 because of thefact that the form of the invention disclosed in FIGS. 10 and l1includes a plurality of sets of casing rollers C-l and C-Z which are ofdifferent sizes for a purpose to be hereinafter described. The body 312is suitably provided with an inner bore 312a which extends for the fulllength thereof so that drilling iluid or other well liquids may passthrough the body 312 during the use of the casing roller construction ofFIGS. l and l1, if desired. The bore 312a may be reduced by providing aninsert 31217 having an internal bore 312C in some instances and suchconstruction isshown in FIG. l0.

Referring nowto FIG. ll in particular, such FIG. 11 of the drawingsshows in detail one of the roller assemblies used in conjunction witheither of the casing rollers C-1 or C-Z, because each of such sets ofcasing rollers C-1 and C-2 is the same, except for size, as is evidentfrom FIG. 10. The pin 311 is preferably substantially identical with thepin l11 of FIG. 2 and therefore it includes an intermediate section311a, an upper section 311-b and a lower section 311C. Normally, theupper section 311i) is elongated as compared to the section 11b of FIG.2, but such elongation is not essential. The roller 310 which is mountedon the intermediate portion 311a of the pin 311 is basically the same asthe reamer cutter of FIG. 2, except that the shape of the roller 310 isdifferent than the cutter 10. The roller or rollers 310 may be formed ina single unitary piece, but preferably they are formed in a plurality ofannular segments which are held together by adhesive or any othersuitable means, and therefore, the rollers 310 are illustrated in thedrawings as made up of a plurality of annular layers which are formed sothat the external surface 31u17 is tapered downwardly except for aslight upward taper near the upper end thereof. The bore '31941 of theroller 316 is provided of slightly greater internal diameter than theexternal diameter of the intermediate portion 3:11a of the pin 311 sothat the roller 310 may rotate freely on the pin 311.

Instead of employing the outwardly extending support collars 14 and 15',the form shown in FIG. 1l is provided with the bores 314:1 extendinginto the body 312 for receiving the upper portion 312 of the pin 311.Likewise, the lower portion 311C of the pin 311 is received in anopening or hole 315a which is formed in the body 312. The body 312 isalso provided with an enlarged recess 312d as compared with the recessV12a to accommodate the positioning of the roller 310 inwardly of 8 thebody 312 a greater distance than in connection with the form, of theinventionn shown in FIGS. 1 and 2.

The body 312 is provided with an upper recess or notch 31411 forreceiving an upwardly extending tab or projection 32th: on an upper wearring 320. Similarly, the body 312 is provided with a recess or notch315s for receiving a tab or projection 321:1 on a lower wear ring 321.Such wear rings 32() and 321 may not be necessary, as explainedpreviously in connection with FIGS. l and 2, although they are desirableso that the wear rings may be replaced when the rollers 310' arereplaced.

The upper portion 311b'0f the pin 311 is provided with laterallyextending openings 311f and 311g which are identical in constructionwith the openings 11f and 11g of FIG. 2. Also, the body 312 is formedwith laterally extending openings 314e and 31412' which are identicalwith openings 14C and 14dl of FIG. 2. Such openings 314C and 314d areadapted to be aligned with the openings 3119 and 311g, respectively, inthe same manner as heretofore described in'connection with FIG. 2, andalso in connection with FIGS. 3-6. Therefore, the pin 311 may be movedand positioned in any one of the positions shown in FIGS. 3-6. Aremovable screw 331 as shown in FIG. 1l would be utilized in theposition shown in FIG. ll to prevent the rod 330 from being withdrawnfrom the opening in which it is positioned prior yto the time desired.For this purpose, a suitable threaded opening 331a corresponding to theopening 31a of FIG. 2 is provided in each of the openings 3140 and 314d.It will be understood that the rod 33t) for locking the pin 311 would bein either the hole 311f or the, hole 311g, as explained previously inconnection With the holes 11]c and 11g of FIG. 2. Therefore, the samegradual outward movement of the rollers 310 with respect to the body 312may be obtained with the form of the invention shown in FIGS. 10 and 11as is described above in connection with FIGS. 1 and 2 and asillustrated in FIGS. 3-6.

' In the use of the casing roller construction shown in FIGS. 10 and l1,the apparatus is lowered into a collapsed casing or pipe P which iscollapsed as indicated at P-l so that the inner diameter of the casingor pipe P is reduced. Such` collapsing of the casing or ,pipe P mayoccur for various reasons and in various ways, as will be understood bythose skilled in the art, but regardless of the manner in which suchcollapsing of the pipe or casing P occurs, the device illustrated inFIGS. 10 and 11 may be used for enlarging the casing or pipe P to returnthe collapsed section P-l to its original bore or diameter. n

To -accomplish such expanding or enlargement of the collapsed sectionP-1 of the casing or pipe P, the apparatus or tool is lowered into thepipe or casing P until the lower set of casing rollers C-2 engage therestricted portion P-1 as shown in FIG. 10. The entire body 312 is thenrotated from the surface and the rollers 310 roll in engagement with theinner surface of the casing or pipe P. Since the rollers 310 are tapereddownwardly, they gradually enlarge or expand the collapsed portion P-1of the pipe P as the body 312 is lowered and is rotated. When thecollapsed portion or section P-1 has been expanded or enlarged to themaximum/extent possible with the rollers 310 set in their originalposition, which would correspond with the position shown in FIG. 3 ofthe drawings, then the rollers 31() are rotated to the second positionwhich would correspond to the position shown in FIG. 4 of the drawings.Such rotation is accomplished in the same manner as previously describedin connection with FIGS. l and 2 wherein an Allen head wrench isinserted into the Allen opening 311e (FIG. 1l), or the pin 311 is turnedin any other suitable manner. It should be noted that access to the pin311 isrprovided by elongated recesses 312e provided in the body 312.Only the lower rollers 310 would be initially changed in position sinceonly the lower set of rollers C-Z would be initially used until they hadbeen used to their maximum extent. Thus, as the rollers in the set C-2are changed in position until they reach the position shown in FIG. 6,they would gradually expand or enlarge the section P-1 to the maximumextent possible with the rollers 310 in the set C-2. Thereafter, theentire body 312 would be lowered to position the rollers 310 in the setC-1 in contact with the then partially enlarged collapsed portion P-1 ofthe pipe P. 'he same procedure would be repeated with the rollers 3-10in the set C-1 and they would be successively used inthe variouspositions illustrated schematically in FIGS. 3-6 until the pipe isexpanded or enlarged at the collapsed portion P-1 to the same orsubstantially the same internal bore or diameter as the rest of thecasing or pipe P.

It should be noted that a recess or groove 312e is provided above eachof the rollers 310, although such groove or recess 312e is not visibleabove the rollers 310 in the upper set C-l as shown in lFlG. l0.

After the complete enlargement or expansion of the collapsed portion Plof the casing or pipe P, the rollers 316 in each set may be replaced ifnecessary. Such replacement can be accomplished by removing the pin 311with any of the rollers 310 which is to be replaced. Such removal iseffected in the same manner as described in connection with the reamercutter of FIGS. l and 2 and briefly is accomplished by pulling the pin311 upwardly until the roller 31@ may be moved laterally away from thepin 311. For that reason, the slots or grooves 312e above the rollers310 must be at least as long as the length of the pins 311 therebelow.The wear rings 320 and 321 may likewise be replaced when the pins 311have been pulled upwardly to the release position.

The pin 311 may be modied as illustrated in FIGS. 7-9, and as describedabove in connection therewith, so that the upper portion 311b and thelower portion 311e lare square as shown in FlG. 7, or so that the pin311 is of uniform diameter with sleeves such as sleeves 211b and 211Cmounted therewith for obtaining the movement of the rollers laterallyoutwardly.

The foregoing disclosure and description of the invention isillustrative and explanatory thereof and various changes in the size,shape and materials, as well as the details of the illustratedconstruction, may be made within the scope of the appended claimswithout departing from the spirit of the invention.

What is claimed is:

l. A reamer comprising, a reamer body, a reamer cutter having a centralbore therethrough and cutter teeth on the exterior thereof, a pin havinga central pin section adapted -to extend through said bore of saidreamer cutter with an upper pin section extending above said cutter anda lower pin section extending below said cutter, a lower support collaron said reamer body having an opening for receiving said lower pinsection, an upper support collar on said remer body having an openingfor receiving said upper pin section, the central axes of said openingsin said collars being coincident, an upper sleeve positioned in saidupper support collar and surrounding said upper pin section, a lowersleeve positioned in said lower support collar, the central axis of saidupper sleeve and the central axis of said lower sleeve being coincidentwith each other and with the central axes of said upper and lowersupport collars, the central axes of said central pin section and saidreamer cutter being coincident with each other but being laterally ofsetwith respect to said central axes of said upper and lower sleeves, saidsleeves being rotatable in said support collars to change the positionof the central axes of said central pin section and said cutter, andmeans to lock said pin to prevent rotation thereof in at least twodiierent positions wherein the distance from said central axis of saidreamer cutter to the central axes of said upper and lower pin sectionsis different in each of such positions, whereby said cutter may beshifted and locked in the shifted position for reaming substantially thesame size of well bore or hole even though the diameter of' said cutteris reduced from wear.

2. The structure set forth in claim l, wherein said means to lock saidpin includes -a lock rod, and laterally extending openings in said pinand said body which are adapted to be aligned for receiving said lockrod when said pin is in each of said different positions.

3. The structure set forth in claim 1, wherein said means to lock saidpin includes a lock rod, one of said collars having at least one lateralhole therein which intersects the opening of the collar, and said pinhaving at least two lateral holes therethrough at different angles withrespect to each other and each of which is adapted to be aligned withsaid lateral hole in said one of said collars for receiving said lockrod to lock said pin in said different positions.

4. The structure set forth in claim l, wherein said means to lock saidpin includes a lock rod, one of said collars having at least two lateralholes at different angles with respect to each other, said pin having atleast one lateral hole adapted to be successively aligned with saidholes in said one of said collars for receiving said lock pin .to locksaid pin in said different positions.

5. The structure set forth in claim l, wherein said sleeves yareconnected to said pin for rotation therewith to said positions.

6. A reamer comprising, a reamer body, a reamer cutter having a centralbore therethrough and cutter teeth on the exterior thereof, a pin havinga central pin section adapted to extend through said bore of said reamercutter with pin end sections extending above and below said cutter, saidreamer body having a lower recess for receiving the lower one of saidend sections and an upper opening for receiving the upper one of saidend sections, the central axes of said central pin section beinglaterally offset with respect to the central axes through said recessand said `opening in said body, said pin being rotatable in said body tochange the position of the central axis of said central pin section withrespect to said central axes of said recess and said opening, a firsthole in one of said end sections and a iirst hole in said reamer bodyadapted to be aligned with each other, a second hole in one of said endsections longitudinally spaced and extending at an angle with respect tosaid irst hole, a second hole in said reamer body longitudinally spacedfrom said first hole in said body and adapted to be aligned with saidsecond hole in said end section when said pin has been rotated to theextent yof said angle, and a locking pin adapted to be positioned insaid first hole in said reamer body and in said end section to lock thereamer cutter in a rst position and also adapted to be removed from saidiirst hole and positioned in said second hole in said body and said endsection when said pin has been rotated to align said second holes.

7. The structure set forth in claim 6, wherein the upper one `of saidend sections has a larger diameter than said central pin section, andwherein the lower one of said end sections has a smaller diameter thansaid central pin section, whereby said pin may be longitudinally removedfrom said body through said opening.

8. The structure set forth in claim 6, wherein said second hole in saidbody is parallel to said first hole, and wherein said angle isapproximately sixty degrees.

9. A casing roller construction for use in expanding or enlarging acollapsed portion of a casing 0r pipe, comprising a support body, acasing roller having a central bore therethrough and an external surfaceadapted to engage the collapsed portion of the casing or pipe, alongitudinally extending pin having a central pin section extendingthrough the bore of said casing roller and end sections extending aboveand below said roller, said body having a lower recess for receiving thelower one of said end sections and an upper opening for receiving theupper one of said end sections, the central axes of said central pinsection being laterally offset with respect to the central axes throughsaid recess and said opening, said pin being rotatable in said body tochange the position of the central axis of said central pin section withrespect to said centr-al axes of said recess and said opening, a firsthole in one of saidend sections and a first hole in said body adapted tobe aligned with each other, a second hole in one of said end sectionslongitudinally spaced and extending at an angle with respect to saidirst hole, a second hole in said body longitudinally spaced from saidiirst hole in said body and `adapted to be aligned with said second holein said end section when said pin has been rotated to the eX- tent ofsaid angle, and a locking pin adapted to be positioned in said iirsthole in said body and in said end section to lock the casing roller in afirst position and also adapted to be removed from said rst hole andpositioned in said second hole in said body and said end section whensaid pin has been rotated to align said second holes.

10. The structure set forth in claim 9, wherein the upper one of saidend sections has a larger diameter than said central pin section, andwherein the lower one of said end sections has a smaller diameter thansaid central pin secl 2 tion, whereby said pin may be longitudinallyremoved from said body through said opening.

11. The structure set forth in claim 9, wherein said second hole in saidbody is parallel to said rst hole, and wherein said angle isapproximately sixty degrees.

References Cited in the le of this patent UNITED STATES PATENTS1,176,964 Hughes Mar. 28, 1916 1,204,022 Hughes Nov. 7, 1916 1,681,651Woodruff Aug. 21, 1928 1,685,327 Kammerer Sept. 25, 1928 1,796,479Santiago Mar. 17, 1931 1,809,258 VertsonV June 9, 1931 1,812,681 BrauerJune 30, 1931 1,848,404 Abegg Mar. 8, 1932 1,893,693 Aloi Jan. 10, 19331,971,561 Hammer Aug. 28, 1934 1,988,023 Spengler Jan. 15, 1935

